This piece is an excellent example of beveled fluorite from "La Sirena", featuring a couple of light blue gemmy intergrown cubes with glassy luster and interesting lenticular surface textures that create a distinctive look from fluorites from elsewhere in Spain. What collectors currently call "La Sirena" is an undefined section of the La Collada de Atas area where there are a few carbonate lenses hosting fluorite replacements that produce green, blue, and purple fluorite of good quality on occasion, but more often than not are really hard to work and produce really tight vugs with little free space inside.